Speaking fluency is an essential part of everyday communication and one of the abilities that students need to develop to effectively learn English. The following skills are necessary for effective speaking: vocabulary, grammar, pronunciation, content, and fluency. This research aims to determine whether there is a significant difference between the personality of extroverted students and introverted students in English-speaking achievement at vocational high school 2 Semarang. In this study, 34 students consisting of 33 females and 1 male were included in the samples using cluster random sampling. This research employs a quantitative experiment and is causal-comparative in type. To collect data, the respondents were given a questionnaire with 20 questions built from extrovert and introvert indicators, as well as questions adapted from the Eysenck Personality Inventory The researcher next assessed the student's speaking skills using a test of speech. The Independent Sample T-test was employed by the researcher to assess the data. The Independent Sample T-test results then revealed that the difference is statistically significant if tcount > ttable, or (0,000476 > 2.03693). The alternative hypothesis is disproved while the null hypothesis is accepted. As a result, there are clear differences between extroverted and introverted students rating their speaking abilities. Extrovert students outperformed introvert students in speaking performance, according to the results. This research is expected to significantly contribute to the development of student learning strategies so that teachers can provide material with the best strategy for students with different personalities.